B - Operations – Transporting – 64 – C
Patent
B - Operations, Transporting
64
C
244/15
B64C 27/04 (2006.01) B64C 21/00 (2006.01)
Patent
CA 1113442
IMPROVED HELICOPTER ABSTRACT OF THE DISCLOSURE An improved helicopter designed to create minimum drag and turbulence in which the main rotor pylon has a top surface having a forward portion defining the rotor head well aperture so as to have a selectively curved lip on the rearward side thereof to eliminate flow separation therefrom of the air being discharged rearwardly from the rotor head well, further having a central portion curving slightly away from the direction of helicopter flight and including a laterally extending boundary layer slot a selected distance downstream of the curved lip through which fluid is expelled substantially parallel to the direction of helicopter flight to energize the surface flow along the pylon top surface, further having a rear portion at a lower elevation extending approximately in the direction of helicopter flight, and having engine and other exhaust ports positioned a selected distance down- stream of the boundary layer control slot through which the exhaust fluids are directed over the rear portion in a direction substantially parallel to the direction of helicopter flight, and terminating in a sharp lip to separate the exhaust flow from the pylon surface thereat. -1-
341401
Swabey Ogilvy Renault
United Technologies Corporation
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